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Graphics Canvas Drawing

Canvas can be used to draw graphs, make photo compositions or do simple animations. Basically, Canvas is a rectangle area like a white paper, we can easily call many functions on a canvas.

We can draw colorful Line, Circle, and Rectangle without animations by the Canvas.

Example of Canvas Drawing

<canvas id="myCanvas" width="200" height="100"></canvas>

Methods used to Draw Line

These are line, methods we are using for draw line:

  • beginPath();
  • moveTo(x, y); - moveTo() Method define the position.
  • lineTo(x, y); - lineTo() Method define the coordinates
  • fill(); - Example (fillRect(x, y, width, height, opecity)).
  • stroke(); - Its make a line visible.
  • closePath(); - Its close the othere unvisible line.
  • fillStyle = "rgba(0,0,0, opicity)"
  • lineCop = "round"; - It use to give shap of line.
<script>
  var c = document.getElementById("myCanvas");
  var context = c.getContext("2d");
  context.moveTo(0, 0);
  context.lineTo(200, 100);
  context.stroke();
</script>

Methods used to Draw Circle

These are circle methods, we are using for draw circle:

  • arc(x, y, radius, start-Angle, end-Angle (2*Math.IP), false);
  • arc styled methods - lineWidth(); strokeStyle(); lineCap();

ARC methods define

arc(); Method of the Canvas 2D API adds an arc to the path which is centered at (x, y) position with radius r starting at star-Angle and ending at end-Angle.

  • x, y coordinates of the arc's center point
  • A radius (r)
  • A star-tAngle, and end-Angle - measured clockwise from the positive x-axis
  • An optional boolean - if true, the arc to be drawn counter-clockwise between the two angles.
<script>
  var c = document.getElementById("myCanvas");
  var context = c.getContext("2d");
  context.begainPath();
  context.acr(95, 50, 40, 0, 2*Math.PI);
  context.stroke();
</script>

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